Predicting Visual Sensitivity in Retinal Prosthesis Patients

Alan Horsager; Scott H. Greenwald; James D. Weiland; Mark S. Humayun; Robert J. Greenberg; Matthew J. McMahon; Geoffrey M. Boynton; Ione Fine

doi:10.1167/iovs.08-2595

FIGURE 2

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Model schematic. The variable time stimulus, f(t), was convolved with a linear filter, δ₁(t). The result of this convolution was passed through a static nonlinearity, N(r₂), and convolved with a secondary linear filter, δ₂(t). It was assumed that a stimulus was at visual threshold (or a given brightness level) when r₃(t) reached a threshold value, θ(r₃).